gdbrunner: Make sure remote lldb-server has +x

Because 'adb push' often misses the executable permission, lldbserver
can fail without any meaningful error messages. This may happen when the
users are on Windows. To fix that, explicitly chmod remote lldbserver
after push.

Bug: 185210505
Test: manual
Change-Id: I88defd4905a9b902424ae8ef4b38a16932b31f02
1 file changed